Regarding Low voltage electrical calculation software, i have been using the software Trace Elec Calc (used to be called Tr-Ciel).
The software allows you to calculate LV installations according to French standard, NFC15-100 or the Belgian regulations, RGIE.
Calculations are been made base on the report of CENELEC R064-003
It works in 3 languages (EN, FR, NL).
It is isnt related to any manufacturer of electrical apparel (contrary to ECODIAL) so you can perform your calculations and dont have to choose one specific brand in ordrer to complete the calculation.
You get detailed calculation sheets, a global single line diagram in dwg form.
If you need more info go to the editor website: http://www.trace-software.com/
best of luck for your quest.